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Chapter 12 Review

Chapter 12 Review. Work and Energy. The transfer of energy to a body by the application of a force that causes the body to move in the direction of the force is called. A. power B. work C. distance D. mechanical advantage.

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Chapter 12 Review

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  1. Chapter 12 Review Work and Energy

  2. The transfer of energy to a body by the application of a force that causes the body to move in the direction of the force is called • A. power • B. work • C. distance • D. mechanical advantage

  3. A boy exerts an average force of 65 N when he lifts a box 1.2 meters. How much work did he do? • A. 0 J • B. 54 J • C. 66 J • D. 78 J

  4. ________ is defined as the rate at which work is done. • A. Power • B. Joule • C. Speed • D. Mechanical advantage

  5. Calculate the mechanical advantage of a wrench that allows you to move a bolt 0.01 m by moving the handle 0.50 m. • A. 0.05 • B. 0.50 • C. 5.0 • D. 50

  6. How much power is required to lift a 30 N chair 0.20 m in 2 sec? • A. 1 Watt • B. 3 Watts • C. 12 Watts • D. 15 Watts

  7. A ramp is a ___________ that decreases the force required to move and object while increasing the distance the object travels. • A. force • B. load • C. newton • D. machine

  8. What is the Mechanical Advantage of a ramp 2 m long and .5 m tall? • A. 1 • B. 2.5 • C. 4 • D. None of the above

  9. Lifting a car using a car jack is easier because it requires ___ • A. Less force • B. Less work • C. Both A and B • D. None of the above

  10. At the top of its arc, a thrown ball has ____ potential energy. • A. maximum • B. minimum • C. zero • D. average

  11. As a dropped penny falls toward the ground, ___ energy is converted to ___ energy. • A. thermal, potential • B. kinetic, vibrational • C. kinetic, heat • D. potential, kinetic

  12. A dropped racquetball will not return to its original position because • A. potential energy is inefficient • B. the mechanical energy is stored up for later bounces • C. some of the mechanical energy is converted to nonmechanical energy • D. energy is not conserved

  13. The law of conservation of energy states that energy • A. is created from motion • B. cannot be created or destroyed • C. is always equal and opposite • D. can only be converted into heat

  14. _____ is the ratio of useful work output to work input. • A. Potential energy • B. Efficiency • C. Kinetic energy • D. Power

  15. How efficient is a machine that uses 130 J to lift a 50 N load 2 m? • A. 19% • B. 52% • C. 77% • D. 87%

  16. __ is a measure of the ability to do work. • A. Photosynthesis • B. Power • C. Respiration • D. Energy

  17. When a pitcher throws a softball to a catcher, the vibration of the individual atoms that make up the softball is considered ___ energy, while the motion of the ball toward the catcher is considered __ energy. • A. nonmechanical, mechanical • B. potential, nonmechanical • C. electrical, thermal • D. mechanical, chemical

  18. What are the two families of simple machines? • A. wedge and compound • B. first class and second class • C. inclined plane and lever • D. pulley and screw

  19. A wedge is a modified __. • A. wheel and axle • B. pulley • C. inclined plane • D. lever

  20. A ramp is a simple machine that allows one to apply an input force __ the output force. • A. perpendicular to • B. equal to • C. greater than • D. less than

  21. Which of the following is an example of a compound machine? • A. scissors • B. ax blade • C. wheel and axle • D. screw

  22. What is the mechanical advantage of a single, fixed pulley? • A. 0.5 • B. 1 • C. 2 • D. 4

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